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Finding the Fourth Proportional to 15,289.80, 21,379.80 and 15,289.80

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Solution

The fourth proportional to 15,289.80, 21,379.80 and 15,289.80 is: 21,379.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,289.80 : 21,379.80 = 15,289.80 : x
  2. Step 2: Convert to fraction form
    15,289.80/21,379.80 = 15,289.80/x
  3. Step 3: Cross multiply
    15,289.80x = 21,379.80 × 15,289.80
  4. Step 4: Simplify right side
    15,289.80x = 326,892,866.04
  5. Step 5: Solve for x
    x = 326,892,866.04/15,289.80
  6. Step 6: Final answer
    x = 21,379.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.